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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

Potentiometer value?

This is the tone circuit of a vintage bogen E30 Amplifier. The tone pot needs replacing . I am a newbie and am not sure of the value.
 

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I'll give your thread a nudge, but that looks like a special pot having both a variable wiper contact and a fixed tap-off point.

I believe the point in question is a "loudness tap".

You should measure the resistance across the extreme ends of the resistance wire, e.g., 250 k ohm.

Then look for a suitable replacement similar to this: https://www.ebay.com/itm/152499146482?chn=ps


1682186652470.png


The tone control is bottom left on the above image.
 
Probably the best line of action is to try to dismantle the tone control and give its internals a thorough clean.

Or perhaps it just needs a squirt of contact cleaner through any and all openings, followed by umpteen rotations to ungum the resistance track.

Perhaps you have already tried that?